I'm in the same boat, been stuck for about 2 weeks now, but I know that if we stick to it, the weight loss will kick-in again.
If you're really only eating 800 calories / day, I would actually recommend 1 day/week of eating 1400-1600 calories/day. This will sort of shock/wake-up your metabolism, kind of like a cup of coffee.
The weight loss should increase the days following your 'big' day as the metabolism increase will hopefully last for a while. Good Luck.